ADTPro transfers disks to and from Apple II and Apple /// computers and the modern world using any of these communications methods: serial/USB, UDP via the Uthernet or LANceGS Ethernet cards, or audio via the Apple's cassette ports. ADTPro has comprehensive bootstrapping support for otherwise diskless Apple IIs. The home page includes extensive tutorials for getting started.
Atari800 is an Atari 8-bit computer (400, 800, and XL and XE series) and Atari 5200 game system emulator for DOS, Windows, Amiga, Atari ST, Mac, and Linux/UNIX. It includes support for Atari cartridge ROMs, popular Atari disk images files, running Atari binaries directly from the host system, and accessing the host filesystem from within the emulated Atari.
Audiotap is a program for conversion between .TAP files and Commodore 64 tapes. It can read WAV files containing the sampled sound of a tape and convert them to .TAP files, and can generate WAV files to be recorded on a tape and used on a Commodore 64. It can also record .TAP files from the sound card and turn .TAP files into sound played to the sound card. It does not require custom-built cables, just plain audio cables connecting the sound card and a normal audio tape player/recorder.
Avrora is a set of tools for programs that run on the AVR series of microcontrollers produced by Atmel. It contains a flexible framework for simulating, analyzing, and optimizing assembly programs, and provides a clean Java API and infrastructure for experimentation, profiling, and analysis.